package com.example.springcloud.alibaba.controller;

import com.alibaba.csp.sentinel.annotation.SentinelResource;
import com.alibaba.csp.sentinel.slots.block.BlockException;
import com.example.springcloud.alibaba.service.PaymentService;
import com.example.springcloud.entities.CommonResult;
import com.example.springcloud.entities.Payment;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import javax.annotation.Resource;

@RestController
@Slf4j
public class CircuitBreakerController {
    @Value("${service-url.nacos-user-service}")
    private String SERVICE_URL;

    //---------------------ribbon+restTemplate
    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/consumer/fallback/{id}")
    @SentinelResource(value = "fallback", blockHandler = "blockHandler", fallback = "handlerFallback")//没有配置
    public CommonResult fallback(@PathVariable("id") Long id) {
        CommonResult result = restTemplate.getForObject(SERVICE_URL + "/paymentSQL/" + id, CommonResult.class, id);

        if (id == 4) {
            throw new IllegalArgumentException("IllegalArgumentException,非法参数异常....");
        } else if (result == null || result.getData() == null) {
            throw new NullPointerException("NullPointerException,该ID没有对应记录,空指针异常");
        }

        return result;
    }

    //本例是fallback
    public CommonResult handlerFallback(@PathVariable("id") Long id, Throwable e) {
        Payment payment = new Payment(id, "null");
        return new CommonResult(444, "兜底异常handlerFallback,exception内容  " + e.getMessage(), payment);
    }

    //本例是blockHandler
    public CommonResult blockHandler(@PathVariable("id") Long id, BlockException blockException) {
        Payment payment = new Payment(id, "null");
        return new CommonResult(445, "blockHandler-sentinel限流,无此流水: blockException  " + blockException.getMessage(), payment);
    }

    //---------------------openFeign
    @Resource
    private PaymentService paymentService;

    @GetMapping("/consumer/paymentSQL/{id}")
    public CommonResult paymentSQL(@PathVariable("id") Long id) {
        return paymentService.paymentSQL(id);
    }
}
